Add the concept of workdays to Rails

workday.rb

# encoding: utf-8

require 'active_support/basic_object'
require 'active_support/core_ext/array/conversions'
require 'active_support/core_ext/object/acts_like'

class Date
 def workday?
   workdays      = ::I18n.t!('definitions.workday.days', :default => (1..5))
   none_workdays = ::I18n.t!('definitions.workday.public_holidays', :default => [[]]) # Returns first elememnt within array if translatio is missing (I18n principle)

   workdays.include?(wday) && !none_workdays.include?(self)
 end
end

class Time
 def workday?
   to_date.workday?
 end
end

module ActiveSupport
 class Duration < BasicObject
 protected
   def sum(sign, time = ::Time.current) #:nodoc:
     parts.inject(time) do |t,(type,number)|
       if t.acts_like?(:time) || t.acts_like?(:date)
         if type == :seconds
           t.since(sign * number)
         # NEW-START: added concept of workday - there is a better way to do it ---------- START
         elsif type == :workdays
           return t if number.zero?

           # if we are NOT on a workday right now, we move to the beginning of the next workday
           if !t.workday?
             while !t.workday? do
               t += 1.day
             end
             t = t.beginning_of_day
           end
           
           workdays_count = number.abs.floor
           delta = number > 0 ? 1 : -1
           count = 0
           while count < workdays_count do
             t = t.advance(:days => delta)
             count += 1 if t.workday?
           end

           # handle fractions
           if (number.abs - workdays_count > 0)
             t = t.advance(:days => delta * (number.abs - workdays_count))
             while !t.workday?
               t = t.advance(:days => delta)
             end
           end

           t
         # NEW-END ------------------------------------------------------------------------- END
         else
           t.advance(type => sign * number)
         end
       else
         raise ::ArgumentError, "expected a time or date, got #{time.inspect}"
       end
     end
   end
 end
end


# *** Numeric extension ***********************************************************************************************
require 'active_support/duration'

class Numeric
 # Adds the concept of workdays to the other rails date extensions (day, weeks ,year etc))
 def workdays
   ActiveSupport::Duration.new(self * 24.hours, [[:workdays, self]])
 end
 alias :workday :workdays
end

# sample locale file that defines workdays and public holidays
en:
  definitions:
    workday:
      days:
        - 1
        - 2
        - 3
        - 4
        - 5
      public_holidays:
        - 2011-12-15

### Usage samples
5.workdays.from_now
1.5.workdays.from_now
1.workday.since(Date.new(2011,1,1))
Date.today.workday?